Joe C Chavez

US Patent:

40964787, Jun 20, 1978

Filed:

Oct 12, 1973

Appl. No.:

5/408967

Inventors:

Joe D. Chavez - Tarzana CA

Assignee:

International Telephone and Telegraph Corporation - New York NY

International Classification:

G01S 942
G01S 9233

US Classification:

343 77

Abstract:

A dual-pulse coherent MTI system having a time interval between pulses as short as zero. The pulses are "chirped" in opposite sense, the latter constituting a unique coding for eliminating range ambiguity problems. Video return signals are received and applied to two parallel channels each containing pulse compression and limiting circuits. The pulse compression circuits are matched uniquely to the positive chirp slope pulse in one channel and to the negative chirp slope pulse in the other channel. The channel corresponding to the earlier of the two pulses is subjected to a fixed delay of one pulse width before the outputs of the channels are differenced to produce a net MTI signal. This is a continuation of application Ser. No. 159,751, filed July 6, 1971, now abandoned.